Sound box



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UNITED STATES PATENT OFFICE.

LOUIS K. SCOTFORD, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE OBO-TONE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SOUND BOX.

Application filed July 9, 1921. Serial No. 483,400.

lie it known that I. Louis K. Sco'rroizo, a citizen of the Vnited States, residing at Chicago, in the coiinty of Cook anc State of Illinois, have invented certain nev,v and us ful Improvements in Sound Boxes, of which the following is a specification.

The present invention relates to sound boxes.

More particularly, the present invention relates to sound boxes for sound reproducing machines and contemplates a novel method of inoilnting the diaphragmy in a sound box. lt has been common practice heretofore. to hold said diaphragm in place by means of an annular ring which, in turn, is held in place by set screws or other holding means.

An object of the present invention is to provide a holding means for a diaphragm in a sound box which is inexpensive to construct and assemble.

A further object is to provide a diaphragm mounting for a sound box which presents a neat appearance.

f A further object is to provide a method of mounting a diaphragm in a Sound box which will be inexpensive and effective.

Further objects will appear as the description proceeds. l

Referring to the drawings, Figure 1 illustrates a sound box embodying the present invention.

Figure 2 is a sectional view taken along the line 2-2 of Figure 1.

Figures 3 and 4 are detail views illustrating the method of practicing the present invention.

The sound box is indicated by the numeral 10. Said sound box has a tone arm connector 11 of the usual construction, which is adapted to be connected to the tone arm of a sound reproducing machine. The sound box is provided with an annular flange 12 adapted to receive the diaphragm 13. Said diaphragm 13 is mounted betweenr tivo annular gaskets .14 and 15. of which gaskets, the one indicated as 14 lies at the bottom of the space provided by the annular ange 12. If preferred. the sound box may be provided with a boss 16 which will lie within the gasket 14 and serve to locate said gasket 11 centrally of the space within the flange 12. The diaphragm 13, together withgaskets 14 and 15. is held in place by means of the bezel 17. The stylus bar 18 will be connected to the f liaghrrigfn l?) and to the .needle socket L19 in a manner -well understood. In ordinary practice. the sourd box will be cast, and in order that the casting may be withdrawn from the mold. the space internally of the 'hinge 12 will be slightly conical, the largest diameter being outermost. This slightly conical conforniation is made use of in the practice of the present invention. The bezel 17, before being mounted within the flange 12, will be a substantially cylindrical member beaded over on one edge as indicated by the numeral 20. The outerr diameter of the cylindrical wall of the bezel 17 should be less than the largest diameter within the annular flange 12-but greater than the least diameter within said flange In mounting the diaphragm 13 within the sound. box, the gasket 14, diaphragm 13 and gasket 15 will be loosely dropped into place and the bezel 17 will be placed' within the space provided by the annular ange 12. Pressure will. be exerted against the beaded portion of the bezel 17 to swage said bezel into uniformly tight engagement with the inner wall of the fiange 12, whereby said bezel 17 will be held securely in place within said fiange 12. The parts will be so designed that when the bezel 17 is pressed home, the diaphragm 13 will be held firmly in place between gaskets 14 and 15. y

The mounting illustrated an`d described is inexpensive, is very effective and presents a good appearance.

One embodiment of the present invention has been described in detail. Many modifications will occur to those skilled in the art. It is intended in this patent'to cover all such modifications that come within the scope of the inventiony as defined by the appended claims.

What I claim as new and desire to secure by Letters Patent in the United States, is:

1. The. method of mounting a diaphragm, which consists of providing a sound box having a conical recess and a bezel having a cylindrical wall portion of an external diame-. ter small enough to enter said recess but too large to seat in the bottom of said recess, mounting said diaphragm and said bezel in said recess and applying pressure on said bezel to force same into said recess with a swaging action.

2. The methodof mounting a diaphragm in a conical recess, which consists in providing e, peil.' oil? emwlfii' gliele-ile @ed plevid'iig n, lbezel havin/f; one ,eide beaded ove: end *elle other falde p ing Seid plein. Side having en ezel 'ueei Smell enough to entei seid reeel-se 4 eem of :jmd eeyl mounting' seid dieplimgm vidi one` ol feld gaskets on each eide thereof :uid said bezel plane side iimei'most in Seid reeese and forcing' seid bezel into seid ieeeee to e poei'ion in which Seid bezel tightly grips the Well seid recess and iii which said geeliees are compressed to grip seid dia- Pillai-1111.l

Seel, readily in the bot mee-ele 23. ln a, Sound box, means providing e round i'eoees having en intern el inwardly tepering wall, e diaphragm mounled in said ifeeess and e bezel for holding said diaphragm in place, Seid bezel having e Vbeaded edge poition @Kei-ling pressure egeiiislsaid diaphragm and elliot-hei1 edge Qolion contacting in Swaged condition with Said tapering Wall. i

Signed et Chicago, Illinois, this 5th day ol July, 1921,

LOUIS l. SCOTFURD. 

